Carburetor accelerating pump



Feb, 6, 19400 J. scHwr-zsss 2,189,554

CARBURETOR ACCELERATING PUMP Filed Jan. 16, 1939 2 Sheets-Sheet 1INVENTOR JOSEPH SCHWEISS MA IQ ATTORNEY 71/145411 Q in! 7/1! I FIJMWM 8I, I

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""llllllllll F I G Patented Feb. 6, 1940 CARBURETOR ACOELERATING PUMPJoseph Schweiss, St. Louis, Mo., assignor to Carter. CarburetorCorporation, St. Louis, Mo., a corporation of Delaware r ApplicationJanuary 16, 1939, Serial No. 251, 14

' i 3 Claims. (o1.10s 14s This invention relates to fluid pump devicesand consists particularly in novel construction of the pressure chamberand valve portions thereof.

The invention is shown applied to the accelerating pump of an internalcombustion engine carburetor although it may be readily adaptable to avariety of different uses.

An object of the invention is to eliminate the leakage and wear whichaccompanies the use' of fluid pumpsutilizing reciprocating pistons.

Another object is to provide greatly simplified inlet and outlet valvestructure for a fluid pump.

These objects and other more detailed objects hereafter appearing areattained substantially by the structure illustrated in the accompanyingdrawings in which Fig. 1 is a vertical transverse section of an internalcombustion engine carburetor. I

Fig. 2 is a partial vertical section of the carburetor and taken on adifferent plane than Fig. 1.

Fig. 3 is an enlarged View showing a part of the structure in Fig. 2.

Fig. 4 is a horizontal section taken on the corresponding section lineof Fig. 3, and

Fig. 5 is a View similar to Fig. 3 but showing a modification.

The carburetor in Figs. 1 and 2 has a downdraft mixture'conduitincluding air inlet horn l venturi 2, and outlet portion '3, flanged asat 4 for attachment to the intake manifold of an associated internalcombustion engine (not shown). A choke valve 5 is pivotally mounted inthe air horn onshaft 6 which extends, at one end, into a housing Ienclosing automatic choke controlling mechanism. A throttle valve 8,near the lower end of the mixture conduit, is provided with a crank 9for manual control. Adjacent the mixture conduit is a bowl it withinwhichiuel is maintainedat a substantially constant level by means of theusual needle valve mechanism ll, controlled by float l2. Fuel issupplied to the bowl by means of an inlet connection l3 and, duringnormal operation, is supplied to the mixture conduit through acalibrated metering orifice member l4, controlled by stepped meteringrod l5, and main nozzle It discharging into the throat of the smallestventuri 2.

An arm I! is mounted on the throttle shaft opposite crank 9 and isconnected by means of a link l8 to a rock lever l9 centrallyfulcrumedupon a pillar block projecting upwardly from the float bowlcover 2|. As shown in Fig. 1, metering rod I5 is carried by lever l9between ment of piston rod 22.

its connection to link l8 and the fulcrum. At the opposite end of leverH), as shown in Fig. 2, a piston rod 22 is connected to lever l9 bymeans of a small link 23.

Piston rod 22extends through bowl cover 2| and, at its lower end, isrigidly connected to the upper wall of a pliable sack, generallyindicated at 24, received within tubular guide 25 extending betweentopand bottom portions of the float bowl. An inlet passage 26 connectsthe float bowl with the interior of sack 24 and an outlet passage2l"coni1ects'the sack with a small nozzle 23 discharging into themixture conduit adjacent venturi 2.

Sack 24, as better shown in Figs. 3 and 4, includescylindrical side wallstructure 29 and end walls 30 and Bi. Side wall structure 29 and endwall 3i] are preferably formed of a continuous 1 sheet of a suitablegasoline resistant, pliable material such as synthetic rubber. Pistonrod 22 is secured to end wall 30 for the application of pumpingpressures to the sack. A series of longitudinally spaced circumferentialribs 32 extend around the outer surface of side wall structure 29 andengage the inner surface of tubular guide 25 so as to provide spaces, asat 33, between the guide and the portions of wall structure 29 betweenribs 32 to accommodate bulging or flexing of the side wall structureduring the application of pumping pressures thereto. Guide 25 funo--tions to restrict distortion of sack 24 to the bulging and collapsingmovement normally incident to pumping.

The other end wall 3i has an. opening 34 communicating with inletpassage 26 and a second opening 35 communicating with outlet passage 21.Wall 3| may be formed of a. block of molded material, such as syntheticrubber, with projecting nipples", as at 36 and 31, projecting oppositelytherefrom and normally closing orifices 34 and 35. and have centralapertures which are normally closed but which yield when fluid pressuresare applied thereto in one direction only to permit the passage or fluidtherethrough. Nipple 36 is arranged to function as an inlet valve topermit drawing of fluid through orifice 34 into sack 24 when the latteris expanded due to upward move- Nipple 37 functions as an outlet valvefor admitting fuel to outlet passage 27 when the sack is collapsed.During the discharge, nipple 36 remains tightly sealed and duringcharging of the sack outlet nipple 31 remains tightly sealed.

These nipples are of resilient material is preferably formed ofresilient material so as to return to its original shape of its ownaccord. In Fig. 5 there is shown a coiled spring 38 in the interior ofsack M for urging upper end wall 30 in an upwardly direction. The otherelements of the structure in Fig. 5 are the same as in the previousform.

The arrangement, form, and adaption of the pumpdevice may be modified invarious ways. For instance, lower end wall 3| may be formed of anysuitable material and inlet and outlet valve nipples 36 and 37 may beseparately formed and secured thereto. I have shown tubular guide 25resting on the upper edge of a shoulder 39 formed on the lower extremityof sack 24 for holding this extremity in fluid tight engagement with thebottom wall of the bowl, guide 25 being held down by bowl cover 2!. Thisarrangement of parts is not essential and also the form of the tubularguide 25 may be carried substantially without detracting from itsfunction as guiding and bracing means for the pliable sack. Theexclusive use of all modifications as come within the scope of theappended claims is contemplated.

I claim:

1. A fluid pump device comprising a sack having wall structure at leastpartly of yielding material, inlet and outlet valves in said wallstructure, means for applying alternate expanding and collapsingpressures to said structure for drawing fluid thereinto and expellingthe same therefrom,

said sack comprising side Wall structure of pliable material and endwalls, there being circumferential ribs on said side wall structure, andguide means extending along said side wall structure and engaging saidribs, the portions of said side wall structure between said ribs beingspaced from said guide means whereby said portions may bulge andcontract during application of pumping pressures to said sack.

2. A fluid pump device comprising a sack formed substantially of pliablematerial having side and end walls, circumferential ribs on the outersurface of said side wall, guide means extending along said wall andengaging said ribs for limiting distortion of said sack to the bul ingand contracting incident to pumping, inlet and outlet valves in one ofsaid end walls, and means for applying pumping pressures to the oppositeend wall.

3. A fluid pump device comprising a rigid tubular guide, a sack formedsubstantially of pliable material inside said guide, said sack havingwall structure including side and end walls, circumferential ribs spacedlongitudinally along said side walls and engaging said guide, inlet andoutlet valves in said wall structure, and means for alternately applyingpushing and pulling forces to one of said end walls to produce bulgingand contraction of the portions of said side walls between said ribs.

JOSEPH SCHWEISS.

